# Checkable `function` in `seedcord` · v0.12.0 Marks a handler class as requiring check execution. Enables the runChecks() method to be called before execute() for handlers that need pre-execution validation. ```ts Checkable(ctor: TypeHandler): TypeHandler ``` Marks a handler class as requiring check execution. Enables the runChecks() method to be called before execute() for handlers that need pre-execution validation. Parameters. - `ctor` `TypeHandler` — The handler to mark as checkable (Do not pass this directly. Just call the decorator without a `()`) Returns `TypeHandler`.